Term
PageSpeed Insights
PageSpeed Insights is Google's free web tool that combines Lighthouse lab scores with CrUX field data from real Chrome users and outputs concrete optimization suggestions.
PageSpeed Insights — explained in more detail
PageSpeed Insights (PSI), available at pagespeed.web.dev, performs two parallel evaluations for any URL: a Lighthouse run in mobile and desktop profiles, plus a fetch of the matching CrUX field data from the past 28 days. Field data appears at the top (“Core Web Vitals Assessment passed/failed”), the synthetic lab data below — supplemented by a list of concrete diagnostics.
PSI is Google’s official answer to the question “Does my page meet the Core Web Vitals thresholds?”. That very value (CrUX, origin or URL-level) feeds into the ranking as a page-experience signal.
Example / practical use
A site looks green in the Lighthouse lab but fails in PSI — the cause is often slow real-user networks or specific devices the lab doesn’t simulate. The CrUX section is then the more honest indicator.
Distinction from related terms
PageSpeed Insights is the web interface; Lighthouse is the underlying audit engine. Search Console additionally offers a Core Web Vitals report across the entire property — good for an overview, less so for diagnosing a single URL.
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